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    <title>Document</title>
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    <script>
        /* 实现一个myEvery方法达到内置every循环效果 */     
        function myEvery(arr,fn){
            for(var i=0;i<arr.length;i++){
                fn(arr[i],i,arr)
            }
        }
        var arr = ["张三","李四","王五"];
        myEvery(arr,function(item,key,arr){
          console.log(item,key,arr)})
    </script>
</body>
</html>